Fixes trove help command

Reason:
- trove help output misplaces the position of "<subcommand> ..."
  from bottom to top.
- This behavior is because of formatting done to
  Print positionals before optionals.

Changes:
- Sequence fixed in trove help output.

Change-Id: I8aff2eec9f915a7ec1960b67ee7ba8423624aad6
Closes-Bug: #1260332
Merge "Fixes trove help command"